1. Section of General Internal Medicine, Department of Medicine, Boston Medical Center, Boston, Massachusetts
2. Section of Infectious Diseases, Department of Medicine, Boston Medical Center, Boston, Massachusetts
3. Boston University School of Medicine, Boston, Massachusetts
4. Massachusetts Department of Public Health, Boston, Massachusetts
5. Department of Biostatistics, Boston University School of Public Health, Boston, Massachusetts
6. Substance Use Disorders Division, McLean Hospital, Belmont, Massachusetts
7. Harvard Medical School, Belmont, Massachusetts